Overview
The LEEB Leeb232 Coating thickness gauge uses magnetic and eddy Current two Measuring methods to detect the film thickness of nonmagnetic coatings on magnetic metal substrates (such as aluminum, chromium, copper, zinc, tin, rubber, paints, etc.), and the film thickness of nonconductive insulating coatings on nonmagnetic metal substrates (such as aluminum, copper, zinc, tin, rubber, plastics, paints, oxide films, etc.). The instrument is used in Eletroplating, anti-corrosion, aerospace, aviation, chemical industry, automotive, shipbuilding, light industry, commodity inspection and other testing fields. It can be used in both laboratories and engineering sites. Different probes are suitable for different occasions, making it a required instrument for the testing industry.
Features
1.There are two measurement methods: continuous measurement and single measurement
2. Has two working modes: direct and group mode
3. With automatic statistics function: average value (MEAN), MAX Maximum (MAX), MIN Minimum (MIN), number of tests (NO.), standard deviation (S. DEV)
4. The instrument can be calibrated by single-point calibrating and two-point calibrating, and the system error of the probe can be corrected by the basic calibrating method
5. Storage function: 4 correction workpieces can be stored, 26 groups per type, 15 pieces per group, a total of 1560 measured values
6. Delete function: Delete a single suspicious data that appears in the measurement, and also delete the data in the storage area for new measurements
7. Set the limit: the measurement value outside the limit can automatically alarm
8. With power undervoltage indication function, there is a beep prompt during operation, and the automatic shutdown mode
9. Metal shell: the fuselage material is aviation aluminum metal shell, low anti-interference abrasion
Principle
This instrument adopts the thickness measurement method of magnetic principle, which can measure the film thickness (such as aluminum, chromium, copper, enamel, rubber, paints, etc.) of the nonmagnetic cover layer on the magnetic metal substrate (such as iron, cobalt, nickel). When the F-type probe is in contact with the cover layer, the probe and the magnetic metal substrate form a closed magnetic circuit. Due to the existence of the nonmagnetic cover layer, the magnetic circuit magnetoresistance changes, and the film thickness of the cover layer can be measured by the change amount of its magnetoresistance. At the same time, the eddy Current measurement principle can be used to measure the film thickness (such as enamel, rubber, paints, plastics, etc.) of the nonconductive coating layer on the nonmagnetic metal substrate (such as copper, aluminum, zinc, tin, etc.). When the N-type probe is in contact with the covering layer, an electromagnetic field is generated in the coil by the high-frequency alternating current, and the eddy Current is generated on the metal substrate, and the feedback effect is generated on the coil in the probe. Film thickness of the covering layer can be derived by measuring the size of the feedback effect.
Applications
Eletroplating, anti-corrosion, aerospace, aviation, chemical industry, automobile, shipbuilding, light industry, commodity inspection
Standards
GB/T 4956-1985 Nonmagnetic film thickness measurement magnetic method on metal substrate, GB/T 4957-1985 nonconductive film thickness measurement eddy current method on nonmagnetic metal substrate, JB/T 8393-1996 magnetic and eddy current film thickness measurement instrument, JJG 889-95 "Magnetoresistive Thickness Gauge", JJG 818-93 "eddy Current Thickness Gauge"
Steps
1. Select the measurement method: continuous measurement or single measurement
2. Select the working method: direct or group
3. Perform calibrating: use single-point calibrating or two-point calibration method
4. Start measurement: Contact the probe with the cover for measurement
5. View statistical results: including average, MAX Maximum, MIN Minimum, number of tests, standard deviation
6. Storage data: measurement data can be saved
7. Delete suspicious data: Delete individual suspicious data that appears in the measurement
8. Set the limit: set the alarm for the measurement value outside the limit
Notice
• Must be calibrated before measurement to ensure accuracy
• Choose the appropriate probe type (F-type or N-type) according to the substrate material
• Pay attention to the minimum curvature radius requirements: convex 1.5mm, concave 9mm
• Pay attention to the minimum area diameter requirement: φ 7mm
• Note Basic Critical Film thickness: 0.5mm
• Operating temperature range: 0~ 40 ℃
• Operating humidity range: 20%~ 90%
• Use AA type alkaline battery 1.5V two power supply
• Pay attention to the power undervoltage indication and replace the battery in time
• Pay attention to the beep prompt during operation
• The instrument has an automatic shutdown function to save power
